1996 Chevrolet Cheyenne Getting Multiple Misfire Code P0300 Did Tune Now M

1996 CHEVROLET CHEYENNE

160,000 MILES

ANONYMOUS

MEMBER
1 POST

I was getting a multiple misfire code p0300.
Did a tune up, now I'm still getting p0308 misfire on cylinder 8.
I pulled the plug, which I just replaced along with cap, rotor and wires to find oil along the threads, and looks worn. But it's only a few days old. Any ideas where to go. Also truck smells of burning oil, no visable leaks. 305 vortec

Dec 31, 2012 at 12:04 AM

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

still 308?? you only mentioned 300 first

Start with compression test. check for spark to the plug as well

Roy

Dec 31, 2012 at 12:18 AM

HUNTWALLEYE

MEMBER
10 POSTS

After my tune up, I've only gotten a p0308

Dec 31, 2012 at 12:40 AM

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

ok, is the plug gap correct??

roy

Dec 31, 2012 at 12:41 AM

HUNTWALLEYE

MEMBER
10 POSTS

Gapped to .06

Dec 31, 2012 at 1:02 AM

HUNTWALLEYE

MEMBER
10 POSTS

I can wipe oil off the threads. Is that a sign of a leaky valve gasket?

Dec 31, 2012 at 1:03 AM

ASEMASTER6371

✓ASE Certified Mechanic
52,796 POSTS

most likely. is it leaking from the valve cover>????

Roy

Dec 31, 2012 at 1:04 AM

HUNTWALLEYE

MEMBER
10 POSTS

Honestly Roy, I'm not sure how to tell..

Dec 31, 2012 at 1:06 AM

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